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This is common in HVAC systems with a single central return. My system does this too. It's simply the nature of a central-return system. The only practical way around it is to have a balanced system with per-room returns sized the same as the supply registers on those rooms.
There are a couple of things you can do about it. One is to spend hundreds to ...

AKA: Dirty Sock Syndrome (paraphrased), caused by the growth of mold and bacteria on the coil. Heat pumps (central HVAC) are particularly susceptible because, unlike conventional heat exchangers, their heating cycles are not hot enough to kill the microbes that thrive on their wet coils during the cooling season. Instead, the temperature is just warm enough ...

Same thing my the system in my house. Uses a MERV 16 5". Smell was the filter itself. Dont know what it picked up, but it was generating its own odor. Whew ! I think it started after I baked a beef roast. which smoked a bit when in the oven.
Maybe something in rhe meat ?

A whistling sound at the return often indicates the grill is too small relative to the duct attached to it.
Does consistently leaving the doors open allow the system to sufficiently heat and cool the home?
For most bedrooms with more than 100 cfm of supply aor a 1 inch door cut is not sufficient opening for return air. If you have carpet installed it is ...

After reviewing the spec sheet for the unit i have found that the LX series has a variable speed blower that will allow the unit to operate under low ambient conditions. Is specifies the system can operate down to 20 degrees. Anything below this and the system will not operate. If you do not have the LX unit and do have the standard, the. The unit is not ...

It is not expected to work, but it might.
Many modern compressors have interlocks that prevent them coming on in too-low temperatures. If there's no interlock or heating element, you could also damage or destroy your compressor if you turn it on at too-low temperatures. This is because it is possible to pull liquid rather than gaseous refrigerant into the ...

You should have a meeting with your contractor and the HVAC contractor, and have them explain exactly what's going on. Ask them to show you whatever calculations they're using to determine the equipment size, and have them explain how a single unit can replace two units.
It's possible that they're installing a larger single unit, to eliminate the need for ...

You and your contractor agreed on duel split systems. However, he contacted an HVAC company who said otherwise and is interestingly, offering a down-sell on this install. (They make their real money up-charging for equipment. So as long as the zoning isn't going to cost big bucks, what's the problem?) My guess is that someone finally got around to doing the ...

It's either a dirty unit or a capacitor problem. If the unit is very dusty you need to clean out the dust to let it breathe. If the capacitor went bad, when you look at it the top will be bubbled up. Most likely it's the capacitor.
Change your filters: a dirty filter is what an AC mechanic loves; it's money in the bank for him.